.top{
    display: flex;
    justify-content:space-between;
}
span{
    display: block;
    font:28px/40px "";
}
.back{
    /* background: url('./img/后退.png'); */
    background-size: cover;
    width:40px;
    height: 40px;
}

.add_video{
    width: 90%;
    height:300px;
    margin: 10px auto;
    margin-top: 50px;
}

.title{
    background: none transparent scroll repeat 0% 0%;
    width: 90%;
    height: 100px;
    border:none;
    margin: 15px auto;
}

.descript{
    background: none transparent scroll repeat 0% 0%;
    width: 90%;
    height: 200px;
    border:none;
    margin: 20px auto;
}
